Was Shredder Splinters Owner?

Shredder reveals that Splinter's daughter, Miwa, had not died and that Shredder had taken her and raised her as his own. Splinter nearly defeats Shredder, only to be attacked by Miwa; Miwa, whose name is now Karai, has been taught, by Shredder, that Splinter is responsible for her mother's death.

Are Splinter and Shredder brothers?

Oroku Saki / Shredder - Splinter's adoptive brother and current arch-nemesis. They fought over Tang Shen when Saki was consumed with jealousy, which resulted in Splinter's house catching ablaze and collapsing on Shen, killing her. Up until this day, Splinter has vividly remembered that moment.

Who was splinters owner?

Hamato Yoshi is a Japanese martial arts master who is somewhat related to Splinter, in some incarnations, he was Splinter's owner until he was killed by the Shredder, while in other incarnations, he was the human form of Splinter before he was either mutated or reincarnated after his death.